A 2nd bucket with just water for rinsing the wash mitt after each section you wash. A grit guard in the bottom is a good idea, too. Removes debris and particles so you don't scratch on next section....

I don't believe anyone would have a problem paying $5 for a pair of stickers. If that gives you a profit of a few bucks at years' end that's ok by me. Spend it on mods, subsidize go karts, or bowling...